Circulatory Arrest, Deep Hypothermia InducedAxillary ArteryHeart Arrest, InducedPerfusionCerebrovascular CirculationAortic AneurysmAneurysm, DissectingAorta, ThoracicCardiopulmonary BypassHypothermia, InducedBlood Vessel Prosthesis ImplantationIntracranial PressurePerfusion ImagingCerebral ArteriesOximesTechnetium Tc 99m ExametazimeMiddle Cerebral ArteryBrainCerebral InfarctionOrganotechnetium CompoundsTomography, Emission-Computed, Single-PhotonIntracranial HypertensionBlood Flow VelocityCerebral AngiographyUltrasonography, Doppler, TranscranialBrain IschemiaCerebral PalsyMyocardial Perfusion ImagingRegional Blood FlowAortic Aneurysm, ThoracicCerebrovascular DisordersMagnetic Resonance ImagingCerebrumBrain InjuriesInfarction, Middle Cerebral ArteryTomography, X-Ray ComputedIofetamineBlood PressureSubarachnoid HemorrhageAcetazolamideSpectroscopy, Near-InfraredTreatment OutcomeTime FactorsBrain DiseasesBlood VolumeMagnetic Resonance AngiographyCoronary OcclusionMonitoring, PhysiologicHemodynamicsOxygenCerebral HemorrhageTomography, Emission-ComputedCardioplegic SolutionsMalaria, CerebralBrain EdemaCollateral CirculationMonitoring, IntraoperativeCerebral VeinsIschemic Attack, TransientHypoxia, BrainArterial Occlusive DiseasesVasospasm, IntracranialCatheterizationCarbon DioxideLaser-Doppler FlowmetryCatheterization, PeripheralXenon RadioisotopesStrokeCoronary CirculationAortic DiseasesExtracorporeal CirculationHomeostasisMoyamoya DiseaseContrast MediaImage Processing, Computer-AssistedCraniocerebral TraumaXenonStentsRadiopharmaceuticalsCerebral RevascularizationAmphetaminesBlood Gas AnalysisFracture Fixation, IntramedullaryProspective StudiesGlasgow Outcome ScaleOxygen ConsumptionEnemaReperfusionRetrospective StudiesCarotid Artery, InternalGlasgow Coma ScaleHypocapniaMicrocirculationDogsSpin LabelsEchoencephalographyFeasibility StudiesOxygen RadioisotopesDisease Models, AnimalVascular Surgical Procedures